Hey @Tibor_Kovacs – the issues in this thread are almost certainly related to the environment, and we have 10s of thousands of users running Airplay devices without issue.
If something isn’t stable for you, I’m absolutely confident we can get your setup rock solid with some more details in a new thread, as described here.
We’ve been investigating the Marantz issue, and all signs point to this being related to a firmware update on the Marantz side – from what we can tell, this device simply no longer supports Airplay 1. Nothing has changed on Roon’s side, and for the moment we have not made any comments regarding Airplay 2 support in Roon.
Anyway, if you’re having issues, we’d love to help so please let us know!